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Rxample - 4: Two identical 200cm3 samples of water were obtained. The oxygen content is measured using the Winkler method, one immediately after collection and

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Rxample - 4: Two identical 200cm3 samples of water were obtained. The oxygen content is measured using the Winkler method, one immediately after collection and one after incubation at 20C for five days. The volume of 0.00100moldm3 aqueous sodium thiosulfate required to react with the iodine was 21.3cm3 initially and 13.6cm3 after incubation. Calculate the biochemical oxygen demand (BOD) of the water

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